Question

an element 'X' have 3 electrons in its outer most third orbit.
(A) what will be its atomic number and number of proton in it.
(B) write its electornic configuration.
(C) what is the method.​

Answer 1

The number of electrons in its valence shell is 3.There for its a metal and has valency -3.

It has 3 shells therefore it's configuration is 2,8,3.

Atomic number is 13 hence protons are also 13.

It's is an electrovalent compound and is hence the method